High Quality Content by WIKIPEDIA articles! Electro Scientific Industries, Inc. (ESI) is a high technology company headquartered in the Portland, Oregon metropolitan area, more specifically in Washington County, in the unincorporated Cedar Mill area north of Beaverton, U.S.A. It is a pioneer developer, and leading supplier, of photonic and laser systems for microelectronics manufacturers. Founded in 1944, it is the oldest high-tech company in Oregon. Along with Tektronix, and later Intel, it has spawned numerous technology-based companies in the Portland area, an area known as the Silicon Forest.